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Module 4: Transport Layer & Congestion Control

20202m

TCP

(i) operates at the data link layer
(ii) is connection-oriented and unreliable
(iii) is connection-oriented and reliable
(iv) is connectionless and unreliable

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Answer: (iii) is connection-oriented and reliable

Why: TCP opens a connection with a 3-way handshake and guarantees ordered, error-free, duplicate-free delivery of the byte stream using sequence numbers, cumulative ACKs, a header checksum, retransmission and flow control. It runs at the transport layer, not the data link layer, so (i) is wrong; it is reliable, so (ii) is wrong; and "connectionless and unreliable" describes UDP, not TCP, ruling out (iv).

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